Observation instrument.



A. P. HARTMANN.

OBSERVATION INSTRUMENT.

APPLICATION FILED PR. I. I913.

ATTORNEY anpanw r. nanrmnn, or rename, NEW roan,

onsnavarron msraumsnr.

License.

Specification of Letters Patent.

Patented Apr. 6,1915.

. Application filed April 1, 1913. Serial No. {7585,1t1.

To all whom it ma concern:

Be itknown t at IQANnnnw P. HART- MANN, a citizen of the llnited States, resid- %%g at Crestwood, Yonkers, in the county of estchester and State of'New York, have invented certain new and useful Improvements in Observation Instruments, of which the following is a specification, reference being had therein the accompanying drawing.

My invention; relates to improvements in observation instruments, and is particularly adapted for and is illustrated in the accompanying drawings in its application to surveying instruments having a sighting device in two planes.

One of the principal objects of my invention is to provide a simple, strong and durable surveying instrument which can be used for the usual urposes to which a surveyin instrument 1s put and which is capable of a plurality of adjustments by which the sighting device can be sighted along lines lying in a plane at an angle with the horizontal plane and a vertical plane, and which can be used for the various different kinds of surveying such as in railroad, mining, building, geographic and geodetic surveyin lu the accompanying drawings I have illustrated in Figure 1, with parts broken away, a vertical side elevation of a surveying instrument illustrating one application of my invention. Fig. 2 1s a view looking from right to left at Fig. 1 with the lower part omitted. Fig. 3 is an enlarged detail of one of the ad ustments hereinafter referred to. Fig. 4.- is a cross section of the two main supporting rings, and Fig. 5 is another enlargement in detail of one of the adjustment means.

6 indicates the usual form of tripod upon the top of which is mounted the usual table 7 carrying the standards 8 upon the top of which is mounted the ring 9 having trunnions 1010 secured by suitable caps such as 11 in the usual well known manner.

12 is an inner split ring, the adjacent ends of which are covered by the clamp indicated by the reference character 13, and 14--14' are suitable brackets supporting the trunnions 15-15 projecting from the telescope 16, said brackets being secured to said inner split ring 12. The said trunni'ons 1515' it will be observed are held 111%?81111011 by suitable caps such as 1717'.

e bracket 14 it will be observed is provided with a hollow interior indicated by the reference character 18 to better advantage in Fig. 3 111.130 wh ch projects the tongue or tail 19 of the ring' 19 between the adjusting screws 20 21, projecting through the side ofsaid bracket, the screw 20 being separated by a Slllllfiblfi'fi rin such as 22 which projects its inner'en as s own;

o '23 is a'suitable adjusting screw for securmg thermglt)? in position. The trunnion. 10 it will be observed is provided with the" triangular member 24 which may be secured by the thumb screw 25, the periphery of said trian lar member being adapted to slide within the frame 26 and being provided with the clamp 27 as shown.

28 is a suitable rotatable post mounted upon the frame 26 and provided with a hole or bore therethrough to receive the thumb screw 29 which enters a similar post 30 upon the clamp 27. When the telescope 16 is to be adjusted the screw 31 of the clamp 27 is loosened and when the telescope has been shifted the same is tightened. To obtain a still finer adjustment the thumb screw 29 is then rotated and the angle is read upon the scale marked upon the triangular member 24: according to its position with reference to the indicating mark upon the frame 26. For adjusting the instrument at right angles to the first adjustment, the screw 32 of the clamp 13 is loosened and the inner ring 12 is shifted to the desired position after which the screw 32 is tightened and the thumb screw 33 is adjusted until a finer adjustment is obtained, the same being read from the scale upon the inner ring 12 with respect to the indicating mark upon the outer rin as shown. A still fur ther adjustment 0 the instrument may be had by tightening the ring 19 by the thumb nut 23, after which the adjustment may be further regulated by the thumb screw 21 which serves to force the tail 19 against the pointed end of the thumb screw 20 to the required extent.

The inner ring 12 is shown in Fig. 4 provided with a peripheral tongue adapted to engage an inner recess in the outer ring 9 as shown. The adjacent ends of the inner ring 12 are indicated by the reference characters 34 and 35 in Fig. 5 where it will be observed they are held in permanent'relation by the jaws of the clamp 13 which may bedrawn together by the screw 32. From this it will be seen that the telescope can be readily adjusted an desired degree n any given position an therefore prov des a greater range of observatlon than 1s provided by the usual type of surveylng 1nstrument.

Of course it will be understood that Vanous modifications may be madewithout departin from the spirit of the lnvention as claimed.

I claim:

1. An observation instrument, comprlsrng a pivotally mounted base, bearings carried thereby, a ring having trunnions lvotedm said bearings, a second ring s11 able with respect to said first ring and having bearings, and a sighting devlce havlng trunnions pivoted in said bearings of said second Lteeeie ring, one of saidrings having graduations, the other of said rings having indicators for cooperating with said graduations.

2: An observation instrument, comprising a base, bearings carried by said base, a ring having trunnions journaled in said bearings a second ring slidably mounted Within said first ring and having bearings, a sightin device having trunnions journaled in sai last-mentioned bearings, said second-mentioned ring being split, and means for clamping said rlngs together.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

4 ANDREW P. HARTMANN. Witnesses:

LOUISE ENDERLE, 'JIHoMAs (I Hnm. 

